nodejs native Permission denied with krb5 (kerboros)

I need quick access to get tokens, when i accessing multiple times from this code:

var krb5 = require('krb5');
var debug = require('debug')('dbg');

var config = {
  target:'http://localhost:3003',
  principal: 'valid@EXAMPLE.COM',
  keytab: '/etc/krb5.keytab',
  service_principal: 'HTTP@localhost',
}

var k = krb5({
  principal: config.principal,
  keytab: config.keytab,
  service_principal: config.service_principal,
  renew: true
});

k.kinit(function(err) {
  if(err)
    return debug("ERR KiNIT",err);

  k.token(function(err, token) {
    if(err)
      return debug("ERR token",err);
    //proxyEmitter.emit('proxy.spengo.token',token);
    return console.log("WWWW",token);
  });
});

So i getting randomly "Permission denied" (even i run this code in root, also installed with sudo npm -g etc...):

[user@host folder]$ DEBUG=* node index.js 
WWWW YIICZA.........etc.....deyGPUA==
[user@host folder]$ DEBUG=* node index.js 
  RestProxy:proxy ERR KiNIT Error: Permission denied
    at Error (native) +0ms
[user@host folder]$ DEBUG=* node index.js 
  RestProxy:proxy ERR KiNIT Error: Permission denied
    at Error (native) +0ms
[user@host folder]$ DEBUG=* node index.js 
WWWW YIICZQYGKwYBBQUCoII........etc...... JylPg=
[user@host folder]$ DEBUG=* node index.js 
WWWW YIICewYGKwYBBQUCoIICbzCCAmugDT.........etc.........2TpjP7QWEAybd
[user@host folder]$ DEBUG=* node index.js 
WWWW YIICZQYGKwYBBQUCo............etc.......KBvX2kXRMDQFQ=
[user@host folder]$ DEBUG=* node index.js 
  RestProxy:proxy ERR KiNIT Error: Permission denied
    at Error (native) +0ms

Have idea?

via YeDaKo